Gooseneck Style Coupler - Model TL-55: features a 3/4" heavy duty steel locking pin. Fits various RAM Gooseneck couplers 20,000lb, 24,000lb, 25,000lb, and 30,000lb - see chart. Use: simply install the narrow end (looks like a goose`s neck) over the coupler bracket near the handle. Bring the wide opening of the TL-55 into position over the wide part of the coupler. Insert the pin into the hole that offers the tighter connection, then install your padlock. ***Padlock is not included***